打开火狐浏览器出现错误

Exception in thread "main" java.lang.NoClassDefFoundError: com/google/common/base/Function

at seleniumTest.Demo.main(Demo.java:9)

Caused by: java.lang.ClassNotFoundException: com.google.common.base.Function

at java.net.URLClassLoader.findClass(Unknown Source)

at java.lang.ClassLoader.loadClass(Unknown Source)

at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)

at java.lang.ClassLoader.loadClass(Unknown Source)

... 1 more